Synthesis and Characterization of Novel Wholly Aromatic Copolyesters Based on 4’-Hydroxybiphenyl-3-carboxylic and  3-Hydroxybenzoic Acids

Mikhailov, P.A.; Zuev, K.V.; Kulichikhin, V.G.

Статья опубликована в высокорейтинговом журнале

Информация о цитировании статьи получена из Scopus
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 1 мая 2024 г.

Авторы: Mikhailov P.A., Zuev K.V., Kulichikhin V.G.
Журнал: Polymers
Том: 15
Год издания: 2023
Издательство: MDPI
Местоположение издательства: Basel, Switzerland
Номер статьи: 2133
DOI: 10.3390/polym15092133
Аннотация: A series of new wholly aromatic (co)polyesters based on m-substituted bifunctional comono-mers - 4'-hydroxybiphenyl-3-carboxylic (3HBCA) and 3-hydroxybenzoic (3HBA) acids with a molar ratio of 3HBCA:3HBA from 0:100 to 60:40 was synthesized. NMR and FTIR spectroscopy methods proved the full compliance of the copolymer composition with the target ratio of comonomers, as well as high compositional homogeneity (absence of block sequences). The re-sulting copolyesters have a sufficiently high molecular weight and their intrinsic viscosity val-ues are in the range of 0.6-0.8 dl/g. Thermal analysis showed that all 3HBCA-3HBA copolyesters are amorphous, and with an increase in the content of biphenyl units (3HBCA), the glass transi-tion temperature increases significantly (up to 190 °C). The onset of intense thermal decomposi-tion of the synthesized polyesters occurs above 450 °C. Thus, this indicates a sufficiently high thermal stability of these polyesters. Rheological measurements have shown that melts of copolyesters with a high content of 3HBCA units exhibit anisotropic properties. At the same time, the method of polarization optical microscopy did not confirm the transition to the liq-uid-crystal state for these polyesters. These results confirm that it is possible to obtain high-performance polyesters based on 3HBCA, but it is not a mesogenic comonomer. Thus, 3HBCA is promising comonomer for synthesis of new thermotropic copolyester with controlled anisotropic properties.
Добавил в систему: Зуев Кирилл Владимирович

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Synthesis and Characterization of Novel Wholly Aromatic Copolyesters Based on 4’-Hydroxybiphenyl-3-carboxylic and 3-Hydroxybenzoic Acidsстатья Исследовательская статья

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